Mobile communication network system, communication control method, non-transitory computer readable medium storing program therefor

Abstract

In a detach request signal that requests detach being received from the mobile station UE ( 27 ), a mobile management node MME ( 22 ) arranged on the core network side in order to perform management control of mobile communication omits the detach processing of the core network side, hold a communication session of the core network side set in the mobile terminal having attached, make a connection between the mobile management node MME ( 22 ) and the mobile station UE ( 27 ) released, disconnect the connection with the mobile station UE ( 27 ) and the core network, and in an attach request signal that requests attach being received from the mobile station ( 27 ), omits the attach processing in the core network side, uses a held communication session regarding to the mobile station ( 27 ) of the core network side and performs the setting of the only radio line.

1 . A mobile communication network system comprising a core network accessed from a mobile terminal through a radio line, wherein
 in a detach request signal that requests detach being received from the mobile terminal, the radio line is released in a state of holding a communication session of the core network side set in the mobile terminal having attached, and   in an attach request signal that requests attach being received from the mobile terminal, the held communication session of the core network side is used, and setting of the radio line is performed,   wherein a mobile management node arranged on the core network side in order to perform management control of mobile communication determines whether or not detach processing and attach processing of the core network side are omitted depending on terminal information and subscriber information that indicate attributes of the mobile terminal, or depending on a parameter added to the attach request signal and the detach request signal.   
     
     
         2 . (canceled) 
     
     
         3 . The mobile communication network system according to  claim 1 , wherein when receiving the detach request signal from the mobile terminal, and omitting the detach processing of the core network side, a mobile management node arranged on the core network side in order to perform management control of mobile communication sets to a session holding timer a time a little longer by a predetermined time than a generation interval of a reattach/redetach request from the mobile terminal as a time to wait for forced release of the held communication session, and when the session holding timer expires without receiving the attach request signal from the mobile terminal, the mobile management node deletes information on the held communication session by making usual detach processing of the core network side carried out, and forcibly releases the communication session. 
     
     
         4 . The mobile communication network system according to  claim 3 , wherein when omitting the detach processing of the core network side in receiving the detach request signal from the mobile terminal, and setting to the session holding timer the time to wait for forced release of the held communication session, the mobile management node stops a timer for periodically updating a routing area, and cancels a subsequent paging request until a reattach request from the mobile terminal is generated, or the session holding timer expires. 
     
     
         5 . The mobile communication network system according to  claim 1 , wherein a mobile management node arranged on the core network side in order to perform management control of mobile communication is a packet switch SGSN (Serving GPRS (General Packet Radio Service) Support Node) established in a 3GPP standard, or a mobile management node MME (Mobility Management Entity). 
     
     
         6 . A communication control method used in a mobile communication network system comprising a core network accessed from a mobile terminal through a radio line, wherein
 in a detach request signal that requests detach being received from the mobile terminal, the radio line is released in a state of holding a communication session of the core network side set in the mobile terminal having attached, and   in an attach request signal that requests attach being received from the mobile terminal, the held communication session of the core network side is used, and setting of the radio line is performed,   wherein a mobile management node arranged on the core network side in order to perform management control of mobile communication determines whether or not detach processing and attach processing of the core network side are omitted depending on terminal information and subscriber information that indicate attributes of the mobile terminal, or depending on a parameter added to the attach request signal and the detach request signal.   
     
     
         7 . (canceled) 
     
     
         8 . The communication control method according to  claim 6 , wherein when receiving the detach request signal from the mobile terminal, and omitting the detach processing of the core network side, a mobile management node arranged on the core network side in order to perform management control of mobile communication sets to a session holding timer a time a little longer by a predetermined time than a generation interval of a reattach/redetach request from the mobile terminal as a time to wait for forced release of the held communication session, and after that, when the session holding timer expires without receiving the attach request signal from the mobile terminal, the mobile management node deletes information on the held communication session by making usual detach processing of the core network side carried out, and forcibly releases the communication session. 
     
     
         9 . The communication control method according to  claim 8 , wherein when omitting the detach processing of the core network side in receiving the detach request signal from the mobile terminal, and setting to the session holding timer the time to wait for forced release of the held communication session, the mobile management node stops a timer for periodically updating a routing area, and cancels a subsequent paging request until a reattach request from the mobile terminal is generated, or the session holding timer expires. 
     
     
         10 . A non-transitory computer readable medium storing a mobile terminal attach/detach processing program for making a computer provided at a mobile management node arranged on the core network side in order to perform management control of mobile communication execute the communication control method according to  claim 6 . 
     
     
         11 . A mobile management node installed in a core network, comprising:
 a unit that manages the movement of a mobile terminal; and   a unit that receives a detach request signal and an attach request signal from the mobile terminal, wherein   when receiving the detach request signal from the mobile terminal, the mobile management node releases a radio line from the mobile terminal while holding a communication session set in the core network,   when receiving the attach request signal from the mobile terminal, the mobile management node uses the communication session held in the core network and sets a radio line from the mobile terminal; and   the mobile management node determines whether or not to omit detach processing or attach processing in the core network depending on terminal information or subscriber information that indicates the mobile terminal, or depending on a parameter added to the attach request signal or the detach request signal.   
     
     
         12 . The mobile management node according to  claim 11 , wherein
 the mobile management node is an SGSN (Serving GPRS Support Node) or an MME (Mobility Management Entity).